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.\"     Title: upscli_list_next
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 02/15/2014
.\"    Manual: NUT Manual
.\"    Source: Network UPS Tools 2.7.1.5
.\"  Language: English
.\"
.TH "UPSCLI_LIST_NEXT" "3" "02/15/2014" "Network UPS Tools 2\&.7\&.1\&." "NUT Manual"
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.SH "NAME"
upscli_list_next \- retrieve list items from a UPS
.SH "SYNOPSIS"
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#include <upsclient\&.h>
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int upscli_list_next(UPSCONN_t *ups, int numq, const char **query,
                       int *numa, char ***answer)
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.SH "DESCRIPTION"
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The \fBupscli_list_next()\fR function takes the pointer \fIups\fR to a UPSCONN_t state structure, and the pointer \fIquery\fR to an array of \fInumq\fR query elements\&. It performs a read from the network and expects to find either another list item or the end of a list\&.
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You must call \fBupscli_list_start\fR(3) before calling this function\&.
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This function will return 1 and set values in \fInuma\fR and \fIanswer\fR if a list item is received\&. If the list is done, it will return 0, and the values in \fInuma\fR and \fIanswer\fR are undefined\&.
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Calling this function after it returns something other than 1 is undefined\&.
.SH "QUERY FORMATTING"
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You may not change the values of \fInumq\fR or \fIquery\fR between the call to \fBupscli_list_start\fR(3) and the first call to this function\&. You also may not change the values between calls to this function\&.
.SH "ANSWER FORMATTING"
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The contents of \fInuma\fR and \fIanswer\fR work just like a call to \fBupscli_get\fR(3)\&. The values returned by \fBupsd\fR(8) are identical to a single item request, so this is not surprising\&.
.SH "ERROR CHECKING"
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This function checks the response from \fBupsd\fR(8) against your query\&. If the response is not part of the list you have requested, it will return an error code\&.
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When this happens, \fBupscli_upserror\fR(3) will return UPSCLI_ERR_PROTOCOL\&.
.SH "RETURN VALUE"
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The \fBupscli_list_next()\fR function returns 1 when list data is present, 0 if the list is finished, or \-1 if an error occurs\&.
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It is possible to have an empty list\&. The function will return 0 for its first call in that case\&.
.SH "SEE ALSO"
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\fBupscli_list_start\fR(3), \fBupscli_strerror\fR(3), \fBupscli_upserror\fR(3)